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I wanna make some space in my D drive. Just 648 mb of free space and the disk have 117GB. I click properties, "Tools" tab, and "Check now" button. That was during too long, so I cancel it. But when I was going to click the drive to find something, it showed me the error "The disk check could not be performed because windows can't access the disk"."

I restarted the pc and try to open, and now is says: "D:\ Application Not Found".

What should I do?

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Most likely you catched some virus. Try to install/run some antivitus software. Faster way will be to right click on your hard drive -> open, and try to find autorun.inf file and then delete it

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